Method:
1 Put the gelatine in a bowl and cover with cold water. Set aside to soak for 5 minutes.

2 Zest 2 clementines and put the zest in a large pan. Squeeze the juice from the zested and whole clementines and add to the pan with the sugar and the vodka (if using).

3 Lift the softened gelatine out of the soaking liquid and add to the pan. Heat gently, stirring until the sugar dissolves. Strain into a large jug with a pouring spout and make up to 1 litre/1¾ pints/4 cups with cold water. Pour into 12 small shot glasses and chill in the refrigerator for at least 5 hours.

4 Take the jellies out of the refrigerator 5 minutes before serving to allow them to soften slightly.